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Ultraviolet photocatalytic degradation of cholesterol on TiO2: secondary ion mass spectrometry

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F17%3A00112484" target="_blank" >RIV/00216224:14310/17:00112484 - isvavai.cz</a>

  • Result on the web

    <a href="https://onlinelibrary.wiley.com/doi/pdf/10.1002/sia.6129" target="_blank" >https://onlinelibrary.wiley.com/doi/pdf/10.1002/sia.6129</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1002/sia.6129" target="_blank" >10.1002/sia.6129</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Ultraviolet photocatalytic degradation of cholesterol on TiO2: secondary ion mass spectrometry

  • Original language description

    Cholesterol (C27H46O stated as M) is used as a model of bio-organic contamination, because this compound is in almost every living organism, and its photocatalytic degradation on titanium oxide (TiO2) surface with UV exposure is investigated. Secondary ion mass spectrometry as a surface-sensitive technique is suited to study this degradation process with focus on intermediates. A fragment of M-OH represents the intact molecule of cholesterol and provides its relative concentration on the surface. The intensity of M-OH decreases after 24-h UV irradiation, and the level of degradation is 89% with the pseudo-first kinetic constant of 0.0207min(-1) within 2h. A fragment of MO-H represents an intermediate as one of the cholesterol oxidation products. The irradiation from a bottom in comparison with a top reveals the differences in the mechanism of the intermediate formation through the intensity and the kinetics with values of factor of 1/3 and 30min, respectively. The roles of electrons and holes, primarily generated in TiO2 by UV, and also of superoxide anion radical and hydroxyl radical, as the secondary reactive species, are discussed to illustrate the bottom/top mechanisms.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10403 - Physical chemistry

Result continuities

  • Project

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2017

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Surface and Interface Analysis

  • ISSN

    0142-2421

  • e-ISSN

    1096-9918

  • Volume of the periodical

    49

  • Issue of the periodical within the volume

    4

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    6

  • Pages from-to

    278-283

  • UT code for WoS article

    000397496800006

  • EID of the result in the Scopus database

    2-s2.0-84981742475